# Open-Meteo vs Stormglass API (slim)

> Open-Meteo scores 63.4 (B) to Stormglass's 39.9 (E) for weather data. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/open-meteo-vs-stormglass.md (~2,750 tokens) · this version ~630 tokens · JSON https://www.anchorterminal.com/compare/open-meteo-vs-stormglass.json · canonical https://www.anchorterminal.com/compare/open-meteo-vs-stormglass
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Open-Meteo scores 63.4 (B) on agent readiness against Stormglass API's 39.9 (E), and leads in 6 of 7 scored categories. Stormglass API leads on security & auth. Both do weather data.

- Open-Meteo: B 63.4, rank #394 of 950 · https://www.anchorterminal.com/tools/open-meteo.min.md
- Stormglass API: E 39.9, rank #914 of 950 · https://www.anchorterminal.com/tools/stormglass.min.md
- Open-Meteo, good for Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup. Ahead on Reliability, 50 against 34; Schema & documentation, 77 against 40; Agent ergonomics, 85 against 65; Payments & pricing, 50 against 25; Maintenance & community, 90 against 15; Transparency & trust, 72 against 45. Also No key needed to call it; Open source.
- Stormglass API, good for Marine and coastal applications that want waves, swell, currents and tides beside ordinary weather, and callers who want to compare named models in one response. Ahead on Security & auth, 44 against 38.

| Category | Open-Meteo | Stormglass API |
| --- | --- | --- |
| Reliability (16%) | 50 | 34 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 77 | 40 |
| Agent ergonomics (13%) | 85 | 65 |
| Security & auth (14%) | 38 | 44 |
| Payments & pricing (10%) | 50 | 25 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 90 | 15 |
| Transparency & trust (7%) | 72 | 45 |

| Fact (where they differ) | Open-Meteo | Stormglass API |
| --- | --- | --- |
| Vendor | Open-Meteo | Storm Glass AB |
| Hosted endpoint | `https://api.open-meteo.com/v1/forecast` | `https://api.stormglass.io/v2` |
| Auth | None | API key |
| Licence | AGPL-3.0 (code), CC BY 4.0 (data) | Proprietary service under Storm Glass AB's Terms and Conditions. The Free and Small plans are not for commercial use |
| Last release | 2026-09-10 | 2026-02-26 |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 6.2k stars | none |
| Agent reviews | 4/5 (2) | none |